| credential | (noun) a document attesting to the truth of certain stated facts | Synonyms: certificate, certification, credentials |
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| differential | (noun) a bevel gear that permits rotation of two shafts at different speeds; used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves | Synonyms: differential gear |
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| (noun) a quality that differentiates between similar things | - |
| (noun) the result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx | Synonyms: derivative, derived function, differential coefficient, first derivative |
| equinoctial | (noun) the great circle on the celestial sphere midway between the celestial poles | Synonyms: celestial equator, equinoctial circle, equinoctial line |
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| essential | (noun) anything indispensable | Synonyms: necessary, necessity, requirement, requisite |
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| exponential | (noun) a function in which an independent variable appears as an exponent | Synonyms: exponential function |
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| inessential | (noun) anything that is not essential | Synonyms: nonessential |
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| initial | (noun) the first letter of a word (especially a person's name) | - |
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| nonessential | (noun) anything that is not essential | Synonyms: inessential |
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| partial | (noun) the derivative of a function of two or more variables with respect to a single variable while the other variables are considered to be constant | Synonyms: partial derivative |
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| (noun) a harmonic with a frequency that is a multiple of the fundamental frequency | Synonyms: overtone, partial tone |
| potential | (noun) the difference in electrical charge between two points in a circuit expressed in volts | Synonyms: electric potential, potential difference, potential drop, voltage |
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| (noun) the inherent capacity for coming into being | Synonyms: potency, potentiality |